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The first man-made plastic was invented by Alexander Parkes in year 1862.

The first man-made plastic was invented by Alexander Parkes in year 1862. He called this plastic Parkesine . The development of plastic materials (example: chewing gum, shellac, etc. ) to the use of chemically modified natural materials (example: rubber, etc. ). Brittle Not flexible

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The first man-made plastic was invented by Alexander Parkes in year 1862.

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  1. The first man-made plastic was invented by Alexander Parkes in year 1862. • He called this plastic Parkesine. • The development of plastic materials (example: chewing gum, shellac, etc. ) to the use of chemically modified natural materials (example: rubber, etc. ).

  2. Brittle • Not flexible • Has the ability to sink in water • Transparent/ translucent • Not magnetic • Does not conduct heat • Does not conduct electricity

  3. Plastic bottles/ Water Bottles • Stationery • Utensils • Spectacles • Chairs • Plastic bag • Book Covers • Watches • Alarm Clocks • Torch lights • Calculators • Files • Etc…

  4. 1. Plastics can be classified by: • their chemical structures • mostly the molecular units that make up the polymer’s backbone and side chains e.g. • the chemical process used in their synthesis, e.g. s condensation, poly-addition, cross-linking, etc. • Their various physical properties, e.g. density, tensile strength, glass transition temperature, resistance to various chemical products, etc. • 2. Some important groups in these classifications are: • The acrylics • Polyesters • Silicones • Polyurethanes • Halogenated plastics

  5. BriefHistory of Wood • The progress of human civilisation created a demand for information. • A need to produce images then emerged. • Wood became the first medium for printmaking

  6. Common Properties of Wood • Moisture Content • Shrinkage • Elasticity • Strength • Vibration characteristics • Density • Permeability • Thermal and Electrical Properties

  7. Common Uses of Wood • Wood has been used to make many things from past to present. Here are a few examples. (There are too many to list down) • E.g. Making a fire • Paper • Housing • Wooden Furniture • Floors

  8. Overview • The common properties of wood are moisture content, shrinkage, elasticity, strength, vibration characteristics, density, permeability and thermal and electrical properties. • Wood is used in our everyday life. • Wood is essential to us.

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